But let him ask in faith, nothing wavering.
The man who lacks wisdom is promised it, but he must ask in faith and not be like a wave of the sea, driven with the wind and tossed. Our Lord said we could move mountains if we commanded them to move and did not doubt in our hearts (Mk. 11:23). The positive side of that is in the next verse, which says, “What things soever ye desire, when ye pray, believe that ye receive them, and ye shall have them.”
Abraham “staggered not at the promise of God through unbelief; but was strong in faith.” There we have the negative and positive again (Rom. 4:20). Some are saved from sin but not from staggering.
“Let him ask in faith, nothing wavering.” Positive and negative! Are you walking by faith or wobbling in doubt? “We lie to God in prayer when we do not rely on God after prayer.” James is very clear: “Let not that man think he shall receive anything of the Lord.”
Asking without believing marks a double-minded man, unstable in all his ways.